Improvement in device foe setting saws



@teiten tetra latcat ft'irr.

HENRY DISSTON, OF PHILADELPHIA, PENNSYLVANIA Letters Patent No. 73,879, dated January 28, 1868.

IMPROVEMENT IN DEVICE POP. SETTING SAWS.

TO'ALL WHOM IT MAY CONOERN:

Be it known that I, HENRY DrssroN, of Philadelphia, Pennsylvania, have invented certain Apparatus for Setting the Teeth of Saws; and I do hereby declare the following to be a full, clear, and exact description ot' the same.

My invention consists of certain apparatus, fully described hereafter, whereby the accurate setting of the teeth ot' circular saws may be facilitated.

In order to enable others skilled in the art to make and use my invention, I will now proceed to describe its construction and operation, reference being had to the accompanying drawing, which forms a part of this specification, and in which- Figure 1 is a side view of my improved apparatus for setting the teeth of saws.

Figure 2, part of the same in section.

Figure 3, a section on the line 1 2, fig. 2; 'and Figure 4 anexterior view of ig. 3.

Similar letters refer to similar parts throughout the several views.

A. is a blockof hard steel, having a gradual taper from its thickest cud, a, to the opposite end, and to the under side of this block is fitted a plate, B, having a gradual taper from its thickest end, to the opposite end, the taper of the block and plate being such that the opposite surfaces of the double block remain parallel to one another, no matter what their relative position longitudinally may be.

The plate B has a longitudinal slot, d, for the reception of the heads of' the set-screws e, the said heads bearing against a shoulder in theplate, and the stems screwing into the block A, as seen in figs. 2 and, so that, after loosening the screws, the relative positions ofthe block and plate longitudinally may be altered at pleasure, and secured, after adjustment, by tightening the screws.

The bleek A, viewed transversely, is scmicircular, but is made Ilat on top throughout its entire length, and, to a limited extent, laterally, and one or more angular recesses are cut in the block in the inclined direction shown in tig. 2, the shape ofthe recess corresponding to that which it is desired to impart to the tooth.

In using thisl device, the block and plate areso adjusted longitudinally that the two combined can be inserted between the tooth z, to beset, and the back, y, of the adjacent tooth, as seen in iig. 2, the point ofthe tooth x entering one of the angular recesses, after whicu it is struck repeatedly by a hammer, moving in the direction indicated by the arrow, until the tooth is expanded to the width and shape of the recess.

In order to retaiin theblockin its proper position during the operation of hammering the tooth, I use two rods, D D, one on each'side-ef the saw, each rod having at one end an eye, 7L, for receiving the block and plate, and the rods being connected together, at the opposite ends, by a pin, t', which lits into the space between two teeth at a point on the circumference of the saw nearly opposite to the tooth operated on.

Eaehrod being provided with a screw-coupling,may be lengthenod or shortened'at pleasure.

There may be several angular recesses, m, in the bleclgiof different forms and dimensions, so that the apparatus may be used for operating on teeth of diil'erent shapes.

I claim as my invention, and desire to secure by Letters Patent- 1. The tapering block A, with one or more angular recesses, in combination with the tapering plate I3, the block and plate being adjustable longitudinally, and beingrotherwise constructed substantially in the manner and for the purpose 'herein set forth.

2. The combination `of' the said block and plate with'the adjustable rods D I), for the purpose specified.

In testimony whereof,I have signed my name to this specification in the presence of two subscribing witnesses.

y l HENRY DISSTON.

Witnesses:

A. Sironi/innen, WM. M. BILLMnYnr.. 

